The difficulty and cost associated with detailed measurements of various parameters at a variety of points in a room make CFD a good alternative if CFD results can be believed. This series of simulations modeled a simple case of a thermal manikin in a room with mixing ventilation. The results of these simulations were then compared to existing experiments. Simulations were conducted using different CFD programs, grids, turbulence models, manikin models, and by different users. The study provides insights on what is the current CFD modeling accuracy that one can achieve, believe, and will need for practice.